Add support for ear files, change naming from gae to appengine, and request PGP credentials from the commandline when pushing to Maven Central.
1.8.7 release
Changed incorrect import for appengine.tasks
Added support for version and appid to override any other version or appid specified in appengine-web.xml
Moved version and appid properties from app closure into appcfg closure
Renamed app closure to download
Updated documentation